How many times has the world/humanity/civilisation (probably civilisation at the largest) been saved from disaster by the actions of one person?
Almost certainly more than we know about, but I would put good odds that it’s less than, say, fifty.
the reason for there being no apparent aliens out there
Great Filter on wikipedia.
Almost certainly more than we know about, but I would put good odds that it’s less than, say, fifty.
Great Filter on wikipedia.